Complicated fibonacci server

From Grider's Docker & Kubernetes course on Udemy.

Video 139 Postgres Database Required Fixes and Updates

updated 6-12-2020

Due to a recent update in the official Postgres image hosted on the DockerHub we need to make a change to our environment variables.

Add the following to your docker-compose.yml file in the postgres service:

postgres:
  image: 'postgres:latest'
  environment:
    - POSTGRES_PASSWORD=postgres_password

docker-compose down && docker-compose up --build

Please note, all of these changes are reflected in the downloadable checkpoint zip files.

Video 141 Required Client Service Update and Worker Environment Variables

In the next lecture, we will be adding a client and worker service. There are two required configuration updates that need to be made:

1. When adding the "Client" service, be sure to include the stdin_open: true configuration:

client:
  stdin_open: true
  build:
    dockerfile: Dockerfile.dev
    context: ./client
  volumes:
    - /app/node_modules
    - ./client:/app

Otherwise, you will get a "React App exited with Code 0" error in your terminal when we attempt to start up the application.

2. When adding the "Worker" service, include the Redis host and port as environment variables:

worker:
  build:
    dockerfile: Dockerfile.dev
    context: ./worker
  volumes:
    - /app/node_modules
    - ./worker:/app
  environment:
    - REDIS_HOST=redis
    - REDIS_PORT=6379

Otherwise, you will get a "Calculated Nothing Yet" error message.

Video 147 Nginx connect() failed - Connection refused while connecting to upstream

A small number of students are hitting an edge case where the nginx upstream connection is failing after they run docker-compose up --build:

connect() failed (111: Connection refused) while connecting to upstream, client:[DOCKER INTERNAL IP], server:, request: "GET / HTTP/1.1", upstream: [NETWORK IP]

The solution they found was to add this to their nginx service in the docker-compose.yml file:

nginx:
  depends_on:
    - api
    - client

Video 151 Important Node Image Version Update

10-26-2020

In the next lecture, we will be creating a Dockerfile for the production server container. The Node v15 image was just released a few days ago and is breaking the code in our server/index.js.

To work around this, we need to change the version of Node this container will use:

FROM node:alpine

to this:

FROM node:14.14.0-alpine

Video 154 Nginx fix for React Router

In the next lecture, we will be adding some Nginx config to the client-side project, but I neglected to add one line that would get the Nginx server to work correctly when using React Router!

In the client/nginx/default.conf file, please add the following line to the end of the location directive:

`try_files $uri $uri/ /index.html;`

The default.conf should now look like this:

    server {
      listen 3000;

      location / {
        root /usr/share/nginx/html;
        index index.html index.htm;
        try_files $uri $uri/ /index.html;
      }
    }

Video 158 Fix for Failing Travis Builds

In the upcoming lecture, we will be adding a script to our .travis.yml file. Due to a change in how the Jest library works with Create React App, we need to make a small modification:

script:
  - docker run USERNAME/react-test npm test -- --coverage

instead should be:

script:
  - docker run -e CI=true USERNAME/react-test npm test -- --coverage

You can read up on the CI=true variable here:

https://facebook.github.io/create-react-app/docs/running-tests#linux-macos-bash

and environment variables in Docker here:

https://docs.docker.com/engine/reference/run/#env-environment-variables

Additionally, you may want to set the following property if your travis build fails with “rakefile not found” by adding to the top of your .travis.yml file:

language: generic